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Home >> Kia >> 2017 >> Forte5 EX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis - 2.0L GDI (2 Of 3) >> DTC P050B: Cold Start Ignition Timing Performance >> Component Inspection >> Component Inspection (OCV) >> Check CVVT (Continuously Variable Valve Timing) Assembly

Check CVVT (Continuously Variable Valve Timing) Assembly

  1. Remove the CVVT assembly. Refer to REMOVAL
  2. Check that the CVVT assembly is locked.
  3. The one of the 2 holes on the cam journal is for advances (upper) and the rest is for retards (lower). Apply masking tape to all oil path holes except the one advance hole ("B") indicated by the arrow as shown in the figure.
    Fig 1: Locating Cam Journal Advance And Retard Holes
    G12150398Courtesy of KIA MOTORS AMERICA, INC.
  4. To release the CVVT lock pin, wrap some tape around the tip of an air pressure adapter and apply low air pressure of approx. 150kPa (1.5kg/cm2 , 21 psi) to the exposed camshaft port. Wrap a shop towel or rag around the CVVT because residual oil may leak out of the unit when applying air pressure.
  5. With low air pressure applied, turn the CVVT to the ADVANCE direction as indicated in the figure.
    NOTE: If too much air leaks when applying the low air pressure, the CVVT lock pin may not release and the CVVT may not turn.
    Fig 2: Turning CVVT To Advance Direction
    G12150399Courtesy of KIA MOTORS AMERICA, INC.
  6. Allow the CVVT assembly to move in the ADVANCE and DELAY directions to ensure there is no binding and that it moves freely.(Movable smoothly in the range about 20°)
  7. Turn the CVVT by hand and make sure it locks in the maximum delay angle position.
  8. Is CVVT assembly working properly?

    YES 

    • Go to next step as below.

    NO 

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